CN112049701B - Steam turbine extraction and heat supply adjusting method for mixing new steam in heating power station - Google Patents
Steam turbine extraction and heat supply adjusting method for mixing new steam in heating power station Download PDFInfo
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- CN112049701B CN112049701B CN202010882448.6A CN202010882448A CN112049701B CN 112049701 B CN112049701 B CN 112049701B CN 202010882448 A CN202010882448 A CN 202010882448A CN 112049701 B CN112049701 B CN 112049701B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/02—Arrangement of sensing elements
- F01D17/08—Arrangement of sensing elements responsive to condition of working-fluid, e.g. pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/02—Arrangement of sensing elements
- F01D17/08—Arrangement of sensing elements responsive to condition of working-fluid, e.g. pressure
- F01D17/085—Arrangement of sensing elements responsive to condition of working-fluid, e.g. pressure to temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/003—Arrangements for measuring or testing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/006—Auxiliaries or details not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/345—Control or safety-means particular thereto
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/38—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating the engines being of turbine type
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Abstract
The invention relates to a steam turbine extraction and heat supply adjusting method system for a heating power station by mixing new steam, and belongs to the field of steam turbine extraction and heat supply. The steam turbine system comprises a steam turbine, an electric shutoff valve, a steam turbine main steam valve, a steam condenser, a generator, the steam turbine main steam regulating valve, a steam turbine steam extraction regulating valve, a steam condenser and an adjustable steam extraction and heat supply pipeline, wherein the electric shutoff valve, the steam turbine main steam valve, the steam turbine steam extraction regulating valve, the steam condenser and the adjustable steam extraction and heat supply pipeline are connected in sequence, the safety valve, the pneumatic quick check valve, the pneumatic quick shutoff valve and the electric shutoff valve are sequentially installed on the adjustable steam extraction and heat supply pipeline, a blending new steam pipeline and a blending heat supply steam pipeline are all connected with a mixing device, a flow measuring device, the electric shutoff valve, the pneumatic quick shutoff valve, the pneumatic regulating valve and the electric shutoff valve are sequentially installed on the blending new steam pipeline, and the safety valve and the electric shutoff valve are sequentially installed on the blending heat supply steam pipeline.
Description
Technical Field
The invention relates to a steam turbine extraction and heat supply adjusting method for a heat supply power station by mixing new steam, belongs to the field of steam turbine extraction and heat supply, and mainly improves heat supply parameters by mixing the new steam of a boiler and the steam turbine extraction so as to meet the requirements of chemical devices.
Background
The national development reform committee, the environmental protection department, and the national energy agency have issued modifying energy sources 2014 2093 text coal-electricity energy conservation, emission reduction, upgrade and modification action plan 2014-2020. In the guideline and action plan of the first chapter, the second action plan clearly indicates that "in 2020, the average coal consumption of the coal-fired power generating unit after being modified is lower than 310 g/kW h, wherein the average coal consumption of the coal-fired power generating unit (except for the air-cooled power generating unit) after being modified is lower than 300 g/kW h. The emission concentration of the air pollutants after the reformation basically reaches the emission limit value of a gas turbine set. "
In Zhejiang province local coal-fired cogeneration of heat and power industry comprehensive transformation and upgrade action plan (Zhe power of letters 2015 371), province and city enterprise investment management departments need strict local heat and power project construction management, the new and reconstructed local heat and power projects need to adopt high-temperature and high-pressure and above parameter backpressure units, secondary high-pressure units are encouraged to be transformed into high-temperature and high-pressure and above parameter units, the existing extraction and condensation units are encouraged to be transformed into backpressure units, and at most one extraction and condensation unit is reserved in a thermal power plant in principle. "
In Zhejiang province cogeneration energy efficiency, energy consumption limitation and calculation method (DB 33/642-2019), the energy efficiency and energy consumption limit values of the heat supply unit can meet the 3-level requirement of the limitation level, namely that the unit heat supply standard coal consumption is less than or equal to 41.1kgce/GJ, and the unit power supply standard coal consumption is less than or equal to 295 gce/kW.h.
At present, partial heat supply power stations and large oil refining petrochemical enterprise power stations have low operating parameters of boilers and turbines in operation, long operation life, relatively low efficiency, obvious aging conditions of equipment bodies and auxiliary system equipment and incapability of meeting the requirements of national and local policies.
In order to respond to the requirements of the national energy-saving and consumption-reducing policy, a large number of power stations are undergoing modification work. The improvement of steam generation parameters of a power station boiler and the improvement of the internal efficiency of a steam turbine generator unit by modifying the through-flow part of a steam turbine are two mainstream modification schemes. Meanwhile, the heat users such as chemical devices often have harsh requirements on steam temperature due to special requirements of the process, but the two transformation schemes can reduce the temperature of the heat supply steam while saving energy and reducing consumption at present.
A schematic diagram of a prior art extraction and heating system for a steam turbine of a power plant is shown in fig. 1.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a steam turbine extraction and heat supply adjusting method for a heat supply power station, which is reasonable in structural design, improves the heat supply temperature by additionally arranging a system and equipment for mixing new steam of a boiler and extracted steam of a steam turbine on the basis of the original steam turbine extraction and heat supply system, so that the requirement of heat users such as chemical devices on the steam temperature is met.
The technical scheme adopted by the invention for solving the problems is as follows: the method for adjusting the steam extraction and heat supply of the steam turbine by mixing the new steam is used for adjusting a steam extraction and heat supply system of the steam turbine, and is characterized in that: the steam turbine steam extraction and heat supply system comprises a steam turbine, a generator, a steam turbine main steam valve, a steam turbine main steam regulating valve, a steam turbine steam extraction regulating valve, a condenser, an electric shutoff valve, a pneumatic quick check valve, a safety valve, a pneumatic regulating valve, a flow measuring device, a mixing temperature device, an adjustable steam extraction and heat supply pipeline, a mixing new steam pipeline and a mixing after heat supply steam pipeline, wherein the electric shutoff valve, the steam turbine main steam valve and the steam turbine main steam regulating valve are sequentially connected, the generator, the steam turbine main steam regulating valve, the steam turbine steam extraction regulating valve, the condenser and the adjustable steam extraction and heat supply pipeline are all connected with the steam turbine, the safety valve, the pneumatic quick shutoff valve and the electric shutoff valve are sequentially installed on the adjustable steam extraction and heat supply pipeline, and the adjustable steam extraction and heat supply pipeline, the mixing new steam pipeline and the mixing after heat supply steam pipeline are all connected with the mixing temperature device, the mixing new steam pipeline is sequentially provided with a flow measuring device, an electric shutoff valve, a pneumatic quick shutoff valve, a pneumatic regulating valve and an electric shutoff valve, and the mixed heat supply steam pipeline is sequentially provided with a safety valve and an electric shutoff valve;
the method for regulating the extraction steam and the heat supply of the steam turbine comprises the following steps:
firstly, setting temperature and pressure parameters of outgoing steam according to the requirements of steam users;
secondly, judging whether the operating pressure meets the requirements of users or not according to pressure measuring point signals arranged on the mixed heat supply steam pipeline;
step three, interlocking the opening degree of a steam extraction regulating valve of the steam turbine on the mixed heat supply steam pipeline pressure measuring point signal;
fourthly, judging whether the operating temperature meets the requirements of users or not according to temperature measuring point signals arranged on the mixed heat supply steam pipeline;
fifthly, interlocking the opening degree of the pneumatic regulating valve on the temperature measuring point signal of the mixed heat supply steam pipeline;
and sixthly, because the pressure of the delivered steam is simultaneously influenced by the flow of the new steam of the new mixing steam pipeline, judging whether the operating pressure meets the requirement again after the operating temperature is calibrated, and returning to the second step for repeated iteration if the operating pressure does not meet the requirement until the operating temperature and the operating pressure parameter of the delivered steam meet the requirement of a user.
Further, in the second step, when the operating pressure of the externally supplied steam is lower than the pressure interval required by the user, the opening degree of the steam extraction regulating valve of the interlocking steam turbine is increased; and when the operating pressure of the externally supplied steam is higher than the pressure interval required by a user, the opening of the interlocking steam turbine steam extraction regulating valve is reduced until the operating pressure meets the requirement.
Further, in the fourth step, when the operating temperature of the externally supplied steam is lower than the temperature range required by the user, the opening degree of the interlocking pneumatic regulating valve is increased; when the operating temperature of the externally supplied steam is higher than the temperature range required by the user, the opening of the interlocking pneumatic regulating valve is reduced until the operating temperature meets the requirement.
Furthermore, one end of the adjustable steam extraction and heat supply pipeline is connected with the steam turbine, the other end of the adjustable steam extraction and heat supply pipeline is connected with the temperature mixing device, one end of the new mixing steam pipeline is connected with the pipeline connected with the electric shutoff valve and the main steam valve of the steam turbine, the other end of the new mixing steam pipeline is connected with the temperature mixing device, and one end of the mixed heat supply steam pipeline is connected with the temperature mixing device.
Furthermore, a new steam inlet, a steam turbine extraction inlet, a mixed steam outlet and a drainage outlet are arranged on the temperature mixing device.
Furthermore, the other end of the adjustable extraction steam heat supply pipeline is connected with an extraction steam inlet of a steam turbine, the other end of the new mixing steam pipeline is connected with the new steam inlet, and one end of the mixed heat supply steam pipeline is connected with a mixed steam outlet.
Furthermore, the number of the electric shutoff valves, the pneumatic quick-closing valves and the safety valves is multiple.
Compared with the prior art, the invention has the following advantages: the steam turbine extraction heating system of new steam mixing that utilizes this application to relate to can be when guaranteeing turbo generator set operation under higher interior efficiency, the extraction heating temperature of control steam turbine satisfies the requirement of dragging the turbine to the admission temperature among the chemical plant device. For example, in a typical ultrahigh pressure unit, when the steam inlet pressure is 13.2MPa, the steam inlet temperature is 540 ℃, and the medium-pressure steam extraction pressure is 3.5MPa, the steam extraction temperature is about 360 ℃, which is difficult to meet the requirement of the dragging turbine in a chemical device on the superheat degree of the steam inlet. The steam extraction scheme of the new steam mixing can be utilized to improve the temperature of the heat supply steam with the steam extraction pressure of 3.5MPa to 430 ℃, and the temperature of the external supply steam can be adjusted in the range from 360 ℃ to about 430 ℃ according to actual needs.
Secondly, due to the reasons of boiler efficiency reduction, low-load operation of the boiler, improper adjustment of combustion in the boiler and the like, the steam at the outlet of the boiler often cannot reach the rated temperature. The temperature of the steam at the outlet of the boiler is reduced, so that the steam inlet quality of the steam turbine is poor, and the extraction temperature is reduced. The steam turbine extraction heating system of the new steam mixing that utilizes this application to relate to can effectively guarantee the steam turbine extraction temperature equally, satisfies the demand of heat consumer to steam temperature.
In addition, the steam extraction temperature of the steam turbine is increased by the aid of the method, so that the steam supply radius of the power station of the oil refining and petrochemical enterprise is remarkably increased.
The system leads out a path of new steam from the front of a main steam valve of the steam turbine and is connected with a temperature mixing device arranged on an adjustable heat supply steam extraction pipeline of the steam turbine. The new steam pipeline is provided with a flow measuring device, an electric shutoff valve, a pneumatic quick-closing valve and a pneumatic regulating valve. The adjustable heat supply steam extraction pipeline of the steam turbine is led out from the cylinder interface and then is sequentially provided with a safe emptying pipeline, a pneumatic quick check valve, a pneumatic quick shutoff valve, an electric shutoff valve and a temperature mixing device. The heat supply pipeline behind the temperature mixing device is provided with a safe emptying pipeline and a shut-off valve which is arranged for convenient maintenance. The steam turbine steam extraction regulating valve opening degree interlocking is arranged on the mixed heat supply steam pipeline pressure measuring point signal, and the mixing pipeline new steam regulating valve opening degree interlocking is arranged on the mixed heat supply steam pipeline temperature measuring point signal.
The new regulating method can control the steam extraction and heat supply temperature of the steam turbine while ensuring that the steam turbine generator unit operates at higher internal efficiency, and meets the requirement of a dragging turbine in a chemical device on the steam inlet temperature.
Drawings
FIG. 1 is a schematic diagram of a prior art power plant steam turbine extraction heating system.
Fig. 2 is a schematic diagram of a steam turbine extraction heating system for a heating power plant utilizing fresh steam blending in accordance with an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a temperature mixing device according to an embodiment of the present invention.
FIG. 4 is a control logic diagram of a steam turbine extraction heating regulation method for a thermal power plant using fresh steam blending in accordance with an embodiment of the present invention.
In the figure: the system comprises a steam turbine 1, a generator 2, a main steam valve 3 of the steam turbine, a main steam regulating valve 4 of the steam turbine, a steam extraction regulating valve 5 of the steam turbine, a condenser 6, an electric shutoff valve 7, a pneumatic quick shutoff valve 8, a pneumatic quick check valve 9, a safety valve 10, a pneumatic regulating valve 11, a flow measuring device 12, a mixing temperature device 13, an adjustable steam extraction heat supply pipeline 14, a mixing new steam pipeline 15, a mixing after-mixing heat supply steam pipeline 16, a mixing steam outlet pipe and a mixing heat supply pipeline 13,
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Examples are given.
Referring to fig. 2 to 4, it should be understood that the structures, ratios, sizes, and the like shown in the drawings attached to the present specification are only used for matching the disclosure of the present specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical essence, and any modifications of the structures, changes of the ratio relationships, or adjustments of the sizes, should still fall within the scope of the present invention without affecting the functions and the achievable objectives of the present invention. In the present specification, the terms "upper", "lower", "left", "right", "middle" and "one" are used for clarity of description, and are not used to limit the scope of the present invention, and the relative relationship between the terms and the relative positions may be changed or adjusted without substantial technical changes.
In order to improve the internal efficiency of a steam turbine generator unit and the comprehensive thermal efficiency of a heating power station, the temperature and pressure parameters of new steam of a boiler are improved by the common scheme at present. In recent years, high-temperature and ultrahigh-pressure units are widely applied and replace the original high-temperature and high-pressure units to become the first choice of a heating power station. However, as the steam inlet pressure of the steam turbine is increased from high pressure (about 8.8 MPa) to ultrahigh pressure (about 13.2 MPa), the steam temperature at the same extraction pressure is reduced by 60-80 ℃, and the requirement of the dragging turbine in the original equipment on the steam inlet temperature is difficult to meet.
The heating power station in the embodiment utilizes a steam turbine extraction and heating adjusting method for mixing new steam, and the steam turbine extraction and heating adjusting method is used for adjusting a steam turbine extraction and heating system.
The steam turbine extraction and heat supply system in the embodiment comprises a steam turbine 1, a generator 2, a steam turbine main steam valve 3, a steam turbine main steam regulating valve 4, a steam turbine extraction regulating valve 5, a condenser 6, an electric shutoff valve 7, a pneumatic quick shutoff valve 8, a pneumatic quick check valve 9, a safety valve 10, a pneumatic regulating valve 11, a flow measuring device 12, a mixing and heating device 13, an adjustable extraction and heat supply pipeline 14, a new steam pipeline 15 for mixing and a mixed heat supply steam pipeline 16, wherein the number of the electric shutoff valve 7, the pneumatic quick shutoff valve 8 and the safety valve 10 is multiple.
In this embodiment, the electric shutoff valve 7, the steam turbine main steam valve 3 and the steam turbine main steam regulating valve 4 are connected in sequence, the generator 2, the steam turbine main steam regulating valve 4, the steam turbine extraction regulating valve 5, the condenser 6 and the adjustable extraction heat supply pipeline 14 are all connected with the steam turbine 1, and the safety valve 10, the pneumatic quick check valve 9, the pneumatic quick shutoff valve 8 and the electric shutoff valve 7 are installed on the adjustable extraction heat supply pipeline 14 in sequence.
In this embodiment, the adjustable steam extraction heat supply pipeline 14, the new mixing steam pipeline 15, and the post-mixing heat supply steam pipeline 16 are all connected to the mixing temperature device 13, the new mixing steam pipeline 15 is sequentially provided with the flow measuring device 12, the electric shutoff valve 7, the pneumatic quick shutoff valve 8, the pneumatic regulating valve 11, and the electric shutoff valve 7, and the post-mixing heat supply steam pipeline 16 is sequentially provided with the safety valve 10 and the electric shutoff valve 7.
In this embodiment, one end of the adjustable extraction heat supply pipeline 14 is connected to the turbine 1, the other end of the adjustable extraction heat supply pipeline 14 is connected to the mixing temperature device 13, one end of the new mixing steam pipeline 15 is connected to the pipeline connecting the electric shutoff valve 7 and the turbine main steam valve 3, the other end of the new mixing steam pipeline 15 is connected to the mixing temperature device 13, and one end of the mixed heat supply steam pipeline 16 is connected to the mixing temperature device 13.
The mixing temperature device 13 in this embodiment is provided with a new steam inlet 17, a turbine extraction steam inlet 18, a mixing steam outlet 19 and a drainage outlet 20, the other end of the adjustable extraction steam heat supply pipeline 14 is connected with the turbine extraction steam inlet 18, the other end of the mixing new steam pipeline 15 is connected with the new steam inlet 17, and one end of the mixing heat supply steam pipeline 16 is connected with the mixing steam outlet 19.
The steam extraction and heat supply adjusting method for the steam turbine in the embodiment comprises the following steps of:
firstly, setting temperature and pressure parameters of outgoing steam according to the requirements of steam users.
Secondly, judging whether the operation pressure meets the requirements of users or not according to pressure measuring point signals arranged on the mixed heat supply steam pipeline 16; when the operating pressure of the externally supplied steam is lower than the pressure interval required by a user, the opening of the interlocking steam turbine steam extraction regulating valve 5 is increased; and when the operating pressure of the externally supplied steam is higher than the pressure interval required by the user, the opening of the interlocking steam turbine steam extraction regulating valve 5 is reduced until the operating pressure meets the requirement.
Thirdly, judging whether the operation temperature meets the requirements of users or not according to temperature measuring point signals arranged on the mixed heat supply steam pipeline 16; when the operating temperature of the externally supplied steam is lower than the temperature range required by a user, the opening degree of the interlocking pneumatic regulating valve 11 is increased; when the operating temperature of the externally supplied steam is higher than the temperature range required by the user, the opening degree of the interlocking pneumatic regulating valve 11 is reduced until the operating temperature meets the requirement.
And fourthly, because the pressure of the delivered steam is slightly influenced by the flow of the new steam of the mixing new steam pipeline 15, judging whether the operating pressure meets the requirement again after the operating temperature is calibrated, and returning to the second step for repeated iteration if the operating pressure does not meet the requirement until the operating temperature and the operating pressure parameter of the delivered steam meet the requirement of a user.
Specifically, the heating power station utilizes a steam turbine extraction and heating system mixed with new steam to lead out a path of new steam from the front of a steam turbine main steam valve 3 to be connected with a temperature mixing device 13 arranged on an adjustable extraction and heating pipeline 14, a flow measuring device 12, an electric shut-off valve 7, a pneumatic quick shut-off valve 8 and a pneumatic regulating valve 11 are arranged on a new steam pipeline 15 for mixing, a safety valve 10, a pneumatic quick check valve 9, a pneumatic quick shut-off valve 8, an electric shut-off valve 7 and a temperature mixing device 13 are sequentially arranged on the adjustable extraction and heating pipeline 14 after being led out from a cylinder interface, and a safety valve 10 and an electric shut-off valve 7 arranged for convenient maintenance are arranged on a mixed heating steam pipeline 16 behind the temperature mixing device 13.
The steam turbine extraction regulating valve 5 opening degree on the steam turbine 1 interlocks the temperature mixing device 13 and then mixes the pressure measuring point signals on the heat supply steam pipeline 16, the steam flow of the extraction and heat supply of the steam turbine 1 is controlled by utilizing the steam turbine extraction regulating valve 5 opening degree, thereby ensuring the heat supply steam pressure at the outlet of the temperature mixing device 13, and when the heat supply steam pressure is lower than the operation pressure interval required by a user, the interlocking steam turbine extraction regulating valve 5 opening degree is increased; when the heating steam pressure is higher than the operation pressure interval required by the user, the opening degree of the interlocking steam turbine steam extraction regulating valve 5 is reduced, and the opening degree of the steam turbine steam extraction regulating valve 5 is changed to enable the operation pressure of the heating steam to be within the operation pressure interval required by the user.
After the pneumatic control valve 11 opening degree interlocking temperature mixing device 13 is arranged on the mixing new steam pipeline 15, temperature measuring point signals on the mixed heat supply steam pipeline 16 are utilized to control the mixing flow of new steam by utilizing the opening degree of the pneumatic control valve 11, so that the heat supply steam temperature at the outlet of the temperature mixing device 13 is ensured, and when the heat supply steam temperature is lower than an operation temperature interval required by a user, the opening degree of the interlocking pneumatic control valve 11 is increased; when the temperature of the heating steam is higher than the operation temperature range required by the user, the opening degree of the interlocking pneumatic regulating valve 11 is reduced, and the opening degree of the pneumatic regulating valve 11 is changed to enable the operation temperature of the heating steam to be within the operation temperature range required by the user.
And after the operation temperature is calibrated, whether the operation pressure meets the requirement needs to be judged again, if not, the opening degree of the steam extraction regulating valve 5 of the steam turbine needs to be adjusted, and the process is repeated until the operation temperature and the operation pressure parameter of the outgoing steam meet the requirement of a user.
The mixing new steam pipeline 15 is provided with a flow measuring device 12 for detecting the flow of the mixing steam, and the economical efficiency of actual operation is considered.
The adjustable steam extraction heat supply pipeline 14 is provided with a safety valve 10 and an emptying pipeline for preventing the failure of the pneumatic quick closing valve 8 and the pneumatic quick check valve 9 from causing the new steam to return to the adjustable steam extraction heat supply pipeline 14 to cause overpressure.
And a safety valve 10 and an emptying pipeline are arranged on the mixed heat supply steam pipeline 16 and are used for preventing the failure of the pneumatic quick closing valve 8 and the pneumatic regulating valve 11 from causing that new steam directly enters the mixed heat supply steam pipeline 16 without pressure reduction to cause overpressure.
The adjustable steam extraction heat supply pipeline 14 is provided with a pneumatic quick check valve 9 and a pneumatic quick closing valve 8 to prevent steam of a plant area heat supply pipe network from returning to the steam cylinder when the steam turbine 1 is subjected to accident working conditions such as load shedding and the like, so that the steam turbine 1 is overspeed.
The post-blending heating steam pipeline 16 is provided with a pneumatic quick-closing valve 8 to prevent the pneumatic regulating valve 11 in the pipeline from being failed to cause overpressure of the subsequent heating pipeline.
The steam turbine can adjust the operation temperature of the chemical device after the extracted steam and the new steam are fully mixed in the temperature mixing device 13 arranged on the pipeline.
An adjustable steam extraction heat supply pipeline 14, a new mixing steam pipeline 15 and a mixed heat supply steam pipeline 16 are provided with an electric shutoff valve 7 at proper positions for realizing online maintenance of a pneumatic regulating valve 11, a pneumatic quick check valve 9, a pneumatic quick shutoff valve 8 and a mixing temperature device 13.
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an illustration of the structure of the present invention. Equivalent or simple variations of the structures, features and principles described in the present patent application are included in the scope of the present patent. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (7)
1. A steam turbine extraction and heat supply adjusting method for a heating power station by using new steam mixing is used for adjusting a steam turbine extraction and heat supply system, and is characterized in that: the steam turbine steam extraction and heat supply system comprises a steam turbine (1), a generator (2), a steam turbine main steam valve (3), a steam turbine main steam regulating valve (4), a steam turbine steam extraction regulating valve (5), a condenser (6), an electric shutoff valve (7), a pneumatic quick shutoff valve (8), a pneumatic quick check valve (9), a safety valve (10), a pneumatic regulating valve (11), a flow measuring device (12), a mixing temperature device (13), an adjustable steam extraction and heat supply pipeline (14), a mixing new steam pipeline (15) and a mixing after heat supply steam pipeline (16), wherein the electric shutoff valve (7), the steam turbine main steam valve (3) and the steam turbine main steam regulating valve (4) are sequentially connected, the generator (2), the steam turbine main steam regulating valve (4), the steam turbine steam extraction regulating valve (5), the condenser (6) and the adjustable steam extraction and heat supply pipeline (14) are all connected with the steam turbine (1), the safety valve (10), the pneumatic quick check valve (9), the pneumatic quick closing valve (8) and the electric shutoff valve (7) are sequentially arranged on an adjustable steam extraction heat supply pipeline (14), the adjustable steam extraction heat supply pipeline (14), a new mixing steam pipeline (15) and a mixed heat supply steam pipeline (16) are all connected with the mixing device (13), a flow measuring device (12), the electric shutoff valve (7), the pneumatic quick closing valve (8), the pneumatic regulating valve (11) and the electric shutoff valve (7) are sequentially arranged on the new mixing steam pipeline (15), and the safety valve (10) and the electric shutoff valve (7) are sequentially arranged on the mixed heat supply steam pipeline (16);
the method for regulating the extraction steam and the heat supply of the steam turbine comprises the following steps:
firstly, setting temperature and pressure parameters of outgoing steam according to the requirements of steam users;
secondly, judging whether the operation pressure meets the requirements of users or not according to pressure measuring point signals arranged on the mixed heat supply steam pipeline (16);
thirdly, the opening degree of the steam extraction regulating valve (5) of the steam turbine is interlocked with the pressure measuring point signal of the mixed heat supply steam pipeline (16);
fourthly, judging whether the operating temperature meets the requirements of users or not according to temperature measuring point signals arranged on the mixed heat supply steam pipeline (16);
fifthly, interlocking the opening of the pneumatic regulating valve (11) on a temperature measuring point signal of the mixed heat supply steam pipeline (16);
and sixthly, because the pressure of the delivered steam is simultaneously influenced by the flow of the new steam of the mixing new steam pipeline (15), judging whether the operating pressure meets the requirement again after the operating temperature is calibrated, and returning to the second step for repeated iteration if the operating pressure does not meet the requirement until the operating temperature and the operating pressure parameter of the delivered steam meet the requirement of a user.
2. A method of regulating extraction and heating of a steam turbine for a thermal power plant using blending of live steam according to claim 1, characterized in that: in the second step, when the operating pressure of the external steam supply is lower than the pressure interval required by the user, the opening degree of the interlocking steam turbine steam extraction regulating valve (5) is increased; when the operating pressure of the external steam supply is higher than the pressure interval required by a user, the opening of the interlocking steam turbine steam extraction regulating valve (5) is reduced until the operating pressure meets the requirement.
3. A method of regulating extraction and heating of a steam turbine for a thermal power plant using blending of live steam according to claim 1, characterized in that: in the fourth step, when the operating temperature of the externally supplied steam is lower than the temperature range required by the user, the opening degree of the interlocking pneumatic regulating valve (11) is increased; when the operating temperature of the externally supplied steam is higher than the temperature range required by the user, the opening degree of the interlocking pneumatic regulating valve (11) is reduced until the operating temperature meets the requirement.
4. A method of regulating extraction and heating of a steam turbine for a thermal power plant using blending of live steam according to claim 1, characterized in that: one end of the adjustable extraction steam heat supply pipeline (14) is connected with the steam turbine (1), the other end of the adjustable extraction steam heat supply pipeline (14) is connected with the mixing temperature device (13), one end of the mixing new steam pipeline (15) is connected with the pipeline connected with the electric shutoff valve (7) and the steam turbine main steam valve (3), the other end of the mixing new steam pipeline (15) is connected with the mixing temperature device (13), and one end of the mixing heat supply steam pipeline (16) is connected with the mixing temperature device (13).
5. A method of regulating extraction and heating of a steam turbine for a thermal power plant using blending of live steam according to claim 1, characterized in that: and a new steam inlet (17), a steam extraction inlet (18) of a steam turbine, a blending steam outlet (19) and a drainage outlet (20) are arranged on the temperature mixing device (13).
6. A method of regulating extraction and heat supply from a steam turbine of a thermal power plant using blending of live steam according to claim 5, wherein: the other end of the adjustable extraction steam heat supply pipeline (14) is connected with a steam turbine extraction steam inlet (18), the other end of the mixing new steam pipeline (15) is connected with a new steam inlet (17), and one end of the mixing heat supply steam pipeline (16) is connected with a mixing steam outlet (19).
7. A method of regulating extraction and heating of a steam turbine for a thermal power plant using blending of live steam according to claim 1, characterized in that: the number of the electric shutoff valves (7), the pneumatic quick-closing valves (8) and the safety valves (10) is multiple.
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